Modified copying files using exec in release-docs grunt task
Modified copying files using exec in release-docs grunt task

dhowe/p5.js,mlarghydracept/p5.js,processing/p5.js,limzykenneth/p5.js,mlarghydracept/p5.js,limzykenneth/p5.js,joecridge/p5.js,dhowe/p5.js,joecridge/p5.js,bomoko/p5.js,bomoko/p5.js,processing/p5.js